pthread mutex

pthead_mutex_t mutex;

1:create:

　　pthread_mutex_init(pthread_mutex_t* mutex, const pthread_mutexattr_t* attr);

2:destroy:

　　pthread_mutex_destory(pthread_mutex_t* mutex);

3:lock:

　　pthread_mutex_lock(pthread_mutex* mutex);

4:lock not block

　　pthread_mutx_trylock(pthread_mutex* mutex);

　　if(pthread_mutex_trylock(&mutex)==0)

　　{

　　　　//lock success

　　}

　　else

　　{

　　}

5:unlock:

　　pthread_mutex_unlock(pthread_mutex_t* mutex);